如何使用FasterXML用注释反序列化XML

Question

我有以下XML模式:

<Courses semester="1">
    <Course code="A231" credits="3">Intermediate A</Course>
    <Course code="A105" credits="2">Intro to A</Course>
    <Course code="B358" credits="4">Advanced B</Course>
</Courses>

我需要将其转换为POJO为:

public class Schedule
{
   public int semester;
   public Course[] courses;
}
public class Course
{
   public String code;
   public int credits;
   public String name;
}

这里有两件重要的事情需要注意:

1. courses对象没有被包装在标签
中
2. 有些属性是属性

我需要如何注释我的对象来获得FasterXML来反序列化这个xml?

Answer 1

您必须将jackson-dataformat-xml依赖项添加到您的项目中:

<dependency>
    <groupId>com.fasterxml.jackson.dataformat</groupId>
    <artifactId>jackson-dataformat-xml</artifactId>
    <version>2.3.3</version>
</dependency>

之后，您可以这样使用XML注释:

@JacksonXmlRootElement(localName = "Courses")
class Schedule {
    @JacksonXmlProperty(isAttribute = true)
    private int semester;
    @JacksonXmlProperty(localName = "Course")
    private Course[] courses;
    // getters, setters, toString, etc
}
class Course {
    @JacksonXmlProperty(isAttribute = true)
    private String code;
    @JacksonXmlProperty(isAttribute = true)
    private int credits;
    @JacksonXmlText(value = true)
    private String name;
    // getters, setters, toString, etc
}

现在，你必须用XmlMapper代替ObjectMapper:

JacksonXmlModule module = new JacksonXmlModule();
module.setDefaultUseWrapper(false);
XmlMapper xmlMapper = new XmlMapper(module);
System.out.println(xmlMapper.readValue(xml, Schedule.class));

上面的脚本打印:

Schedule [semester=1, courses=[[code=A231, credits=3, name=Intermediate A], [code=A105, credits=2, name=Intro to A], [code=B358, credits=4, name=Advanced B]]]